Lignin derivatives for improved suspension and reservoir drilling
OwnerShadaab S. Maghrabiinventor
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Abstract
An oil-based reservoir drill-in fluid (RDF) comprising an oil-based RDF additive that includes a blend, reaction product, or mixture thereof, of (A) one or more hydrophobizing component or agent (e.g., an amine or amide containing compound), and (B) one or more phenolic material or composition comprising phenolic polymers or salts thereof (e.g., lignin, a lignin derivative, or mixture thereof), which may be utilized as an oil-base RDF additive or as a component of an oil-based RDF additive, is described. A method of drilling a reservoir section of a wellbore with the oil-based RDF, the method including the oil-based RDF additive.
Claims29
An oil-based reservoir drill-in fluid (RDF) comprising an invert emulsion of a hygroscopic liquid, one or more weighting or bridging agent that includes a weighting or bridging agent, an oil-based RDF additive, and at least one of:
- an oil, mineral oil, synthetic oil (e.g., one or more of internal olefin, poly alpha olefin, and linear paraffin), or a combination thereof, wherein the oil-based RDF further comprises:
- a blend, reaction product, or a mixture thereof, of:
- one or more hydrophobizing component or agent, and
- one or more phenolic material or composition comprising phenolic polymers or salts thereof.
A method of drilling a reservoir section of a wellbore, the method comprising:
- circulating an oil-based reservoir drill-in fluid (RDF) when:
- the drill penetrates the reservoir section, the drill is drilling the reservoir section, or both,
- wherein the oil-based RDF includes (i) one or more weighting or bridging agent that includes an acid soluble weighting or bridging agent and (ii) an oil-based RDF additive comprises a blend, reaction product, or a mixture thereof, of:
- one or more hydrophobizing component or agent (e.g., about 5 to about 75 percent by weight of the hydrophobizing component or agent), and
- one or more phenolic material or composition comprising phenolic polymers or salts thereof (about 25 to about 95 percent by weight of the phenolic material or composition).
Dependencies are inferred from the claim text.